/Engine/Source/Editor/AudioEditor/Classes/SoundSubmixGraph/SoundSubmixGraph.h
Find an existing node that represents a given SoundSubmix
[USoundSubmixGraphNode](API\Editor\AudioEditor\SoundSubmixGraph\USoundSubmixGraphNode) * FindExistingNode ( [USoundSubmixBase](API\Runtime\Engine\Sound\USoundSubmixBase) * SoundSubmix ) const